Excavation Shoring in Markham, ON | OCM Excavation

OCM Excavation installs engineered shoring on deep digs across Markham — Unionville, Cornell, Berczy, Cathedraltown, Box Grove, and Thornhill. Markham soil varies more than most GTA cities: silty clay through the south, and pockets of shallow bedrock and dense till in the north. That mix changes which shoring method makes sense, and we size the system to what the dig actually hits. Once depth passes 1.2 metres, Ontario law requires support. For a same-week site visit, call 416-317-3090.

Markham Soils and What That Means for Shoring

In the southern half of Markham, soil is typical GTA silty clay — Type 2 or 3 under Ontario Regulation 213/91, which means shoring kicks in at 1.2 metres. In northern pockets, shallow bedrock and dense glacial till reduce collapse risk in the upper layers but raise excavation cost because over-digging and rock breaking enter the picture. Either way, the dig face still needs to be safe for anyone entering it. The right shoring choice gets cheaper when it’s matched to actual soil rather than picked from a default spec.

Shoring Systems We Run in Markham

• Hydraulic trench shores for residential trenches 1.2 to 3 metres deep — weeping tile, sewer laterals, foundation repair pits, addition footings.
• Steel trench boxes for long utility trenches and any run where workers move along the trench all day.
• Soldier pile and lagging for deep basement excavations on tight Markham lots and for digs that sit against an existing footing.
• Slide rail systems for wider parallel-utility excavations where standard shore widths don’t span.

Our Yanmar SV40 mini excavator handles hydraulic shore placement in side-yard footprints common across newer Markham subdivisions. On deeper basement digs, a larger excavator pairs with engineered shoring drawings and lagging boards.

When Markham Homeowners Hit Shoring

The repeat calls we get from Markham involve basement lowering for a legal second suite, additions where the new foundation sits beside the existing house, foundation repair on older Unionville and Thornhill homes, and replacing a failed septic with a sewer line into the road. Anything past 1.2 metres of depth needs shoring or a properly engineered slope. If your contractor is quoting deep work in Markham without mentioning shoring at all, that’s a red flag worth a second opinion.

Engineering and Permits

Markham building permits are issued through the City’s Building Standards Department. Shoring drawings normally ride with the foundation or underpinning permit submission rather than as a standalone permit. Excavations past roughly 3 metres in depth, or any system supporting an adjacent foundation, need sealed drawings from a Professional Engineer in Ontario. We line up that engineering directly so the design lands before the dig opens up.

Typical Cost Range

Residential shoring jobs in Markham generally run from $8,000 to $50,000. A short hydraulic-shored sewer trench lands near the low end. A soldier pile system supporting a full basement dig on a tight lot with engineering and monitoring sits at the upper end. Bedrock pockets in north Markham can lower shoring cost slightly while raising the excavation line — overall the project still lands in that range.

Why Markham Owners Choose OCM

We’re a GTA excavation crew that owns its shores, trench boxes, and mini excavator. That keeps Markham shoring quotes clean of rental margins and lets us move quickly when a job needs to start. We’re fully insured under our commercial liability policy and we don’t enter a trench over 1.2 metres without a compliant support system. For a Markham shoring estimate, call 416-317-3090.

Related work: our service areas, basement underpinning in Markham, the sibling Richmond Hill shoring page, and Markham excavation contractor services.

Frequently Asked Questions

Does shallow bedrock in north Markham eliminate the need for shoring?

Bedrock can reduce shoring needs at depth — rock walls don’t collapse the way clay does. But the upper layers above bedrock are still soil, and the 1.2-metre rule applies to that section. Most north Markham digs still need shoring in the upper portion plus rock-breaking budget below it.

Can I shore a basement lowering without disturbing my neighbour’s lot?

Yes. Internal underpinning sequences and lot-line soldier pile systems keep the work inside your property line. We document the neighbour’s foundation condition before starting and stage the dig so any one section is only open for a short window. Engineered drawings cover load paths and movement limits.

Is shoring required for septic-to-sewer connection trenches in Markham?

If the trench goes past 1.2 metres and a worker enters it, yes. Septic-to-sewer connections in Markham often run deep where the road sewer is below frost line plus working depth. Steel trench boxes are the usual answer because they slide along as the line is laid.

How does Markham building review handle shoring drawings?

The City’s Building Standards Department reviews shoring as part of the broader foundation or underpinning permit submission for residential projects. Standalone shoring permits are less common in residential work. Sealed engineering drawings are required for deeper or lot-line systems, and the City reviews them with the structural package.

How quickly can you get shoring on site in Markham?

Standard hydraulic shores or trench boxes can be on a Markham site within the same week we’re booked. Engineered soldier pile systems need one to two weeks for stamped drawings and a few days for materials. Call 416-317-3090 with the depth and site details and we’ll give you a realistic window.

Get a Markham Shoring Quote

For shoring on any Markham deep excavation, call OCM Excavation at 416-317-3090 or send the details through our contact page. We’ll match the system to depth and soil and price it openly.

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